The AS-1800 is a ruggedly built wireless receiver designed with features for the professional. With a 150 mW output to the ear buds, the AS-1800R is loud enough for any environment. The receiver has a squelch adjustment, stereo/mono switch, LCD display, button lock, and a Magnesium Alloy Construction.Built rugged for the road and with attention to quality for the musician. One very important aspect of the AS-1800R receiver is the Mixed Mono feature. With Mixed Mono the performer can have the vocal mix in Input 1 and the band mix in Input 2 and adjust the volume of each independently to create a personal mix, or you can send two different monitor mixes from the board so each performer can decide which mix he or she wants to hear on their belt pack.